Directions : In the following questions,...

Directions : In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/ Phrase.
Scientific knowledge is no longer a closed book in this 21st century.

an unopened book

a covered book

a mystery

a mysterious book

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The correct Answer is:

a closed book : a person that you know nothing about I can.t figure her out, she.s a closed book to me. The best option is a mystery.

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Directions : In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/ Phrase. Scientific knowledge is no longer a closed book in this 21st century.

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Directions : In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/ Phrase.
Scientific knowledge is no longer a closed book in this 21st century.